Because if they don't they will lose some advertising contracts. Facebook's reason to exist is to try and turn a profit, not to exist as a place for people to p

Because if they don't they will lose some advertising contracts. Facebook's reason to exist is to try and turn a profit, not to exist as a place for people to post without censorship. I imagine someone realized that people who would leave if sexual assault 'humor' was banned make them less than the advertisers who would leave were the jokes not banned.